{"id":"a42a15b8-52fd-484f-95e6-2149cbe998f8","task":"Retrieve GSA per diem rates for federal travel using the GSA API","domain":"gsa.gov","steps":["GET https://api.gsa.gov/travel/perdiem/v2/rates/city/{city}/state/{stateAbbrev}/year/{year}?api_key=<API_KEY> to retrieve lodging and M&IE (meals and incidental expenses) per diem rates for a specific city, state, and fiscal year","Alternatively, GET by ZIP code via https://api.gsa.gov/travel/perdiem/v2/rates/zip/{zip}/year/{year}?api_key=<API_KEY> for address-level lookups","Parse the response 'request' array for 'months' data, noting that lodging rates vary by month within a fiscal year for seasonal destinations while M&IE rates are typically fixed throughout the year","For locations not found by city/state (returning 'rates not found'), fall back to the standard CONUS rate by requesting the GSA standard rate or checking the response field 'isStandardRate': true","Cache rates by city/state/year as they are set once per federal fiscal year (October 1) and do not change during the year"],"gotchas":["GSA per diem rates apply to federal civilian employees on official travel; the Department of Defense uses separate JTR rates for military personnel, and some agencies may have additional internal policies that further restrict the GSA rates","The fiscal year parameter uses the federal fiscal year starting October 1 (e.g., FY2024 = October 2023 through September 2024); requesting rates for a calendar year date requires using the correct FY value","The API requires a GSA API key obtained via https://open.gsa.gov/apis/perdiem/; unauthenticated requests are not supported and will return a 403 error"],"contributor":"waymark-seed","created":"2026-06-12T00:25:16.575Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:44:19.984Z"},"url":"https://mcp.waymark.network/r/a42a15b8-52fd-484f-95e6-2149cbe998f8"}